Rock drill



March 15 1927.

c. C. HANSEN ROCK DRILL Filed Nov. 19, 1925 0 v 5* v\m;\\\ Z 5 V INVENTOR.

" (7]; les aHanae-n- BY M ' 1115 A11 0 NgY CHARLES c. nmvsnn orrasron, PENNSYLVANIA, ASSI'GNOETO INoERso-IjL RAivn COMPANY, or JERSEY"CITY,'NEW mnsnrh cosrorcArroiv on NEW JERSEY.

DREEIZEL.

Application filed Novem ber an. oscillatory distributing valve of the plate type to be suitably mounted in a cylindrical bore,vto protect the valve ch est against Wear, and. to simplify the construction and reduce the manufacturing cost of valves of this type.

@ther objects will-the in part obvious and in part pointed out hereinatter.

The invention consists of the combinations of elements, vfeaturesof construction and arrangement of parts having the. general mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated the accompanying drawings, in Which-- I Figure l is an elevation in section of so much of a rock drill as will serve to illustrate the invention and showing the valve and the piston in one position;

' Figure 2 is a view similar to Figure 1 and showing the valve and'the' piston in: another position,

Figure 3 is a transverse View in section taken through Figure 1 on thewline 3-3 looking in the direction of thearrovvs,

Figured i-sa perspective view of the'ivalveg and I Figure 5 is an end-view of the valve.

Referring to the drawings, the invention is shown embodied in a-roclr drill'havin g a cylinder A provided with a free exhaust port B. lVithin the cylinder A is areciprocatory hammer piston C having a forward extension or nose D; In this instance'the" cylinder A is sealed at its front: end: by a head'E which receives slidahly the nose D of thepiston U and the rearward end of the cylinder is provided with 'aclosure in the form of a back head F;

The parts so far described are shown merelyfor illustrative purposes, accordingly; the back head F is shown solid.-

In accordance with the present invention, the valve chest G, preferably formed integrallywith the cylinder and longitudinally thereof is provided with acylindrical-bore H. An endwall J in"thisinstance forms' a closure for one end of the bore H and the opposite end of said bore is screw threadedas at K to receive a suitable sealingplugL- instrument whereby 19,1925; swarm. 69 954.

Whichmay be provided with a slot 0- for the reception of screw driver or other suitable the plug may be screwed into the end of the bore H.

Within the cylindrical bore- H in thisinstancelisarranged a" filler piece or valve seat P having passages Q and-Rnear the'rfront andrearendszthcreofs The passagesQ and R communicate with passages S and? Tleading to the front andirearends era cylinderrA' for the admission of pressure. fluid. to said cylinder for reciprocating the piston-' 0. The; valveseat Pisprefe'rablyot partly circular or, as illustrated, of semiecircular cross sectionalarea and accordingly-has a semicylindrical surface Ute cooperate with the cylindrical wall of the bore The valve seat P in this instance is also'providcdwith afiat surface V which serves asa seating surface for an oscillatory plate valve W. Theoscil'latory plate valve 7 is preferably ot a length approximately equal to the length of the stroke of the-piston G plusthe so I the" roof of the bore H- for holding the seat ing portion of the valve WV onaitsseat; Surfaces Y and Z of the valve 7 which control the passages R and Q, respectively are in this instance formed at angle to each other so 'that when one'surtace Y orZ contacts withrthe' surface V of the seat l9, the other surface Y or Z will be'raised from the surface V at an angle equal to the angle of the surface Y to the surface Z; Y

Suitable common means are provided for holdingthe valve seat P and the valve W v in operativeposition with respect to each" other;- To this end the valve seat P is provided with a transverse semi-circular: slot 6 to receive slida-bly: a pin 0 anchored at its ends in: the valve chestG as shown at- (Lin. Figure 3. A transverse'partl y circularslot e soniewhatsimilar to the slot 2), is formed through the valve WV to'cooperate pivotally with: the pin 0 whereby the valveWV, is: held against longitudinal. movement. The slot 6 is of slightly greater depth than the slot 6'. sotha-t a clearance exists between the topv of said slot and 'the pin: 0. In this way the valve W contactsonly with'the pin' c atthe entrance- 0t thesl'ot e,

Pressure fi'u idfor operating the drill niay be supplied to the bore Hthrough ZUICOIIIIGO the valve W down on the surface V.

tion 7. In this instance a pair of passages g and h aflord communication between the connection f and the cylindrical bore h.

Incthe operation of the rock drill: Let it be assumed that the piston is about to start on its forward stroke as indicated in Figure 1. The front end of the cylinder A will then be open to the atmosphere through the exhaust port B. In this position of the piston, pressure fluid admitted into the cylindrical bore H will force the front end fif T e rearward end of the valve will then be raised as illustrated in Figure 1 to admit pressure fluid through the passages R and T into the rearward end of the cylinder A and impel the piston C forwardly. After the free exhaust port 13 in the cylinder A is covered by the piston C, atmospheric air entrapped in theforward end of the cylinder will becompressed and will act against the surface Z of the valve W tending to unseat the front end of the valve. As the piston nears the end ofits forward stroke, the exhaust port B will again be uncovered by the rearward end of the piston and pressure fluid utilized for impelling the piston forwardly will be exhausted'through said exhaust port to the Owing to the drop in pressure thus obtained beneath the rearward end of the valve, the pressure fluid acting on top of said rearward end, augmented by the compression acting against the front end of the valve will rock the valve about the pin 0 so that the rearward end of the valve is pressed downwardly'against the face V to close the passage R leading to the rearward end of the cylinder A. In this position of the valve, pressure fluid will flow over the front end of the valve and through the passages Q, and S into the front end of the cylinder and impel the piston C rearwardly, thus completing the cycle of operations.v

By pivoting the valve W on the pin 0 in the manner described, a shifting fulcrum will be obtained, that is the valve surface exposed to reduced pressure during the operation of the valve varies with the position of the valve. This is illustrated in Figure 1, in which only the surface Z of the valve rests on the surface V of the valve seat P.

. In this position of the valve, the combined areas of the surface Y and of the slot 6 are raised from the surface V of the seat P. After the piston-C has travelled forwardly to permit the rearward end of the valve W to be rocked against the surface V, the sur face Z and the slot 6 will be raised from the valve seat.

The advantages of this invention reside chiefly in the fact that an oscillatory valve of the plate type may bemounted in a cylin-' drical bore. over methods This is a distinct advantage employed heretofore for mounting valves of this type.

may be quickly and economically formed to receive the valve and its seat, the valve parts may be quickly assembled or disassembled and the valve-chest G will be protected against any wear which might otherwise be caused by the valve W were the valve allowed to come in direct contact with the chest.

In the drawings, the valve seat P is illustrated as being equal to the length of the unthreaded portion of the bore H so that the outer end of the valve seat P is shown as contacting with the plug L. If desired, however, the valve seat P may be shortened somewhat so that it will be out of contact with the parts adjacent said ends.

I claim:

1. In a fluid actuated rock drill, the combination of a cylinder and a reciprocatory piston, a free exhaust port in the cylinder controlled by the piston, a valve chest having a cylindrical bore, an oscillatory plate valve in the bore, a removable valve seat seated on the cylindrical wall of the bore, and common means for holding the valve and the bination of a cylinder and a reciprocatory piston, a free exhaust port in the cylinder controlled by the piston, a valve chest having a cylindrical bore, an oscillatory plate valve in thebore, a removable valve seat seated on the cylindrical wall of the bore, and common means extending through adjacent faces of the valve and the valve seat for holding said valve and said valve seat in operative position.

3. In a fluid actuated rock drill, the combination of a cylinder and a reciprocatory piston, a free exhaust port in the cylinder controlled by the piston, a valve chest hav ing a cylindrical bore, an oscillatory plate; valve in the bore, a removable valve seat in the bore and having a surface to cooperate with the cylindrical wall of the bore, and a pin extending through the valve chest and. through the valve and the valve seat to serve as a pivot for the valve and to hold the valve and the valve seat in operative position.-

4. In a fluid actuated rock drill, the combination of a cylinder and a reciprocatory piston, a free exhaust port in the cylinder controlled bythe piston, a valve chest having a cylindrical bore closed at one end, an oscillatory plate valve in the bore, a removable valve seat in the bore and having a surill face to cooperate with the cylindrical wall of the bore, said valve and said valve seat being insertable through the open end of the bore, a plug for closing the open end of the bore, and a pin cooperating with the valve and the valveseat for holding said valve and valve seat in operative position.

5. In a fluid actuated rock drill, the combination of a cylinder and a reciprocatory piston, a free exhaust port in the cylinder controlled by the piston, a valve chest having a cylindrical bore, a removable valve seat occupying one side of the bore and seated on the cylindrical wall of the bore,'a pin extending through one side of the valve seat for holding said valve seat in position, an oscillatory plate valve pivoted on said pin and held against endwise movement by said pin, and a bridge on said valve to cooperate with the bore for holding the valve 7 on said pin.

. the wall of the bore and a flat surface, an

6. In a fluid actuated rock drill, the combination of a cylinder and a reciprocatory piston, a free exhaust port in the cylinder controlled by the piston, a valve chest having a cylindrical bore, a removable valve seat occupying one side of the bore and having a partly circular surface to seat on seat occupyingone side of the bore and having a partly circular surface and a flat surface, an oscillatory plate valve on said flat surface, a pin extending through adjacent facesof the valve and the valve seat for holding said valve and said valve seat in operative position and to serve as a pivot for the valve, and a bridge on one side of the valve to cooperate with the bore for holding said valve on the pin.

8. In a fluid actuated rock drill, the com bination of a cylinder and a reciprocatory piston, a free exhaust port on the cylinder controlled-by the piston, a valve chest having a cylindrical bore, a removable valve seat occupying one side of the bore and having a partly circular surface and a flat surface, passages through the valve seat for supplying pressure fluid to the ends of the cylinder, an oscillatory plate valve on said flatsurface for controlling said passages, a pin insertable transversely through the valve chest to extend throughthe valve and the valve seat for holding said valve and valve seat in operative position and to serve as a pivot for the valve, and a bridge on one side of the valve to cooperate slidably with v the bore for holding the valve on the pin.

9; In a fluid actuated rock drill, the combination of, a cylinder and-av reciprocatory piston, a freeexhaust port in the cylinder controlled by the piston, a valve chest having a cylindrical bore extending longitudi nally of the cylinder, a semi-circular removable valve seat occupying one side of the 'bore and having a flat surface, said valve seat having passages through its ends leading to the ends of the'cylinder, a plate valve adapted to oscillate on said flat surface for controlling the passages, slots transversely through adjacent faces of the valve and the valve seat, a pin extending through the slots and anchored at its ends in the valve chestfor holding said valve and valve seat in operative position and to serve as a pivot for the valve, and a bridge on one'side of the valve to cooperate with the wall of the;

bore for holding the valve on the pin.

In testimony whereof I havev signed this g specification.

CHARLES 0. SEN. 

